package com.n1web.ops;

import javax.servlet.ServletException;  
import javax.servlet.http.HttpServlet;  
import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpServletResponse;  
 
 
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.List;
 
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
 



	 /**
	  * Servlet implementation class UploadServlet
	  */
	 @WebServlet("/UploadServlet")
	 public class UploadServlet extends HttpServlet {
	     private static final long serialVersionUID = 1L;
	      
	     // 上传文件存储目录
	     private static final String UPLOAD_DIRECTORY = "temp/";
	  
	     // 上传配置
	     private static final int MEMORY_THRESHOLD   = 1024 * 1024 * 5;  // 5MB
	     private static final int MAX_FILE_SIZE      = 1024 * 1024 * 10; // 10MB
	     private static final int MAX_REQUEST_SIZE   = 1024 * 1024 * 20; // 20MB
	  
	     /**
	      * 上传数据及保存文件
	      */
	     protected void doPost(HttpServletRequest request,
	 		HttpServletResponse response) throws ServletException, IOException {
	 		// 检测是否为多媒体上传
	 		if (!ServletFileUpload.isMultipartContent(request)) {
	 		    // 如果不是则停止
	 		    PrintWriter writer = response.getWriter();
	 		    writer.println("Error: 表单必须包含 enctype=multipart/form-data");
	 		    writer.flush();
	 		    return;
	 		}
	  
	         // 配置上传参数
	         DiskFileItemFactory factory = new DiskFileItemFactory();
	         // 设置内存临界值 - 超过后将产生临时文件并存储于临时目录中
	         factory.setSizeThreshold(MEMORY_THRESHOLD);
	         // 设置临时存储目录
	         factory.setRepository(new File(System.getProperty("java.io.tmpdir")));
	  
	         ServletFileUpload upload = new ServletFileUpload(factory);
	          
	         // 设置最大文件上传值
	         upload.setFileSizeMax(MAX_FILE_SIZE);
	          
	         // 设置最大请求值 (包含文件和表单数据)
	         upload.setSizeMax(MAX_REQUEST_SIZE);
	         
	         // 中文处理
	         upload.setHeaderEncoding("UTF-8"); 

	         // 构造临时路径来存储上传的文件
	         // 这个路径相对当前应用的目录
	  //       String uploadPath = getServletContext().getRealPath("./") + File.separator + UPLOAD_DIRECTORY;
	         String uploadPath = getServletContext().getRealPath("./")+ UPLOAD_DIRECTORY;
	        
	          
	         // 如果目录不存在则创建
	         File uploadDir = new File(uploadPath);
	         if (!uploadDir.exists()) {
	             uploadDir.mkdir();
	         }
	  
	         try {
	             // 解析请求的内容提取文件数据
	             @SuppressWarnings("unchecked")
	             List<FileItem> formItems = upload.parseRequest(request);
	  
	             if (formItems != null && formItems.size() > 0) {
	                 // 迭代表单数据
	                 for (FileItem item : formItems) {
	                     // 处理不在表单中的字段
	                     if (!item.isFormField()) {
	                         String fileName = new File(item.getName()).getName();
	                         //String filePath = uploadPath + File.separator + fileName;
	                         String filePath = uploadPath +  fileName;
	                         File storeFile = new File(filePath);
	                         // 在控制台输出文件的上传路径
	                         System.out.println(filePath);
	                         // 保存文件到硬盘
	                         item.write(storeFile);
	                         request.setAttribute("message",
	                             "文件上传成功!");
	                         request.setAttribute("tempfile", filePath);
		                         	                         
	                     }
	                 }
	             }
	         } catch (Exception ex) {
	             request.setAttribute("message",
	                     "错误信息: " + ex.getMessage());
	             request.setAttribute("tempfile", "");
	         }
	         // 跳转到 message.jsp
	         getServletContext().getRequestDispatcher("/pages/upload/uploadok.jsp").forward(
	                request, response);
	         
	         
	         
	     }
	 }
	 




